KERN & SOHN GAB 30K-3PM - Manual (Page 9)

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2.2 Keyboard overview
1. Bubble level
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
2. Storage battery status display
Power supply connected Icon is glowing for power supply via power pack
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If the LED lights green, the rechargeable battery is fully charged.
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When the battery is being recharged, the LED lights red
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